Reprap Forum - Stepper Motors, Servo Motors, DC Motors Discuss here what makes your printer moving. https://reprap.org/forum/list.php?160 Wed, 10 Jun 2026 23:44:13 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?160,897027,897046#msg-897046 Re: Vellemann K8400 drv8825 Probleme https://reprap.org/forum/read.php?160,897027,897046#msg-897046 VDX Stepper Motors, Servo Motors, DC Motors Fri, 01 Aug 2025 05:52:40 -0400 https://reprap.org/forum/read.php?160,897027,897040#msg-897040 Re: Vellemann K8400 drv8825 Probleme https://reprap.org/forum/read.php?160,897027,897040#msg-897040
Sie müssen außerdem vref auf die gleiche Position wie beim alten Treiber einstellen.


Einige technische Details zu Ihrem Controller [cdn.velleman.eu]]]> Dust Stepper Motors, Servo Motors, DC Motors Fri, 01 Aug 2025 04:54:17 -0400 https://reprap.org/forum/read.php?160,897027,897033#msg-897033 Re: Vellemann K8400 drv8825 Probleme https://reprap.org/forum/read.php?160,897027,897033#msg-897033 Du hast auch keine Idee?]]> Dream61 Stepper Motors, Servo Motors, DC Motors Fri, 01 Aug 2025 03:06:39 -0400 https://reprap.org/forum/read.php?160,897027,897032#msg-897032 Re: Vellemann K8400 drv8825 Probleme https://reprap.org/forum/read.php?160,897027,897032#msg-897032
Nachdem das aber in letzter Zeit Alles ziemlich ruhig geworden ist, kann das schon etwas dauern, bis jemand antwortet ... ist halt keins von diesen "ultramodernen" highspeed-Chat-Foren B)-]]> VDX Stepper Motors, Servo Motors, DC Motors Fri, 01 Aug 2025 02:50:49 -0400 https://reprap.org/forum/read.php?160,897027,897030#msg-897030 Re: Vellemann K8400 drv8825 Probleme https://reprap.org/forum/read.php?160,897027,897030#msg-897030 deutschsprachigen Forum wechseln?

Ich habe Bilder der Treibermodule, wobei das schwarze Modul das defekte ist und das lila Modul das neue darstellt, mit dem ich aktuell Probleme habe.
Ich weiß leider nicht, welchen software oder Firmware der drucker hat, da müsste ich erst nachschauen. Ich habe den Drucker geschenkt bekommen, da er nicht funktionierte. Nun habe ich alles zusammengebaut und eingerichtet. Ich habe dan diagnostiziert, dass dieses Modul defekt ist.]]> Dream61 Stepper Motors, Servo Motors, DC Motors Fri, 01 Aug 2025 00:02:05 -0400 https://reprap.org/forum/read.php?160,897027,897028#msg-897028 Re: Vellemann K8400 drv8825 Probleme https://reprap.org/forum/read.php?160,897027,897028#msg-897028
Übrigens gibt's hier auch ein Deutschsprachiges Forum B)

[reprap.org]]]> VDX Stepper Motors, Servo Motors, DC Motors Thu, 31 Jul 2025 16:04:45 -0400 https://reprap.org/forum/read.php?160,897027,897027#msg-897027 Vellemann K8400 drv8825 Probleme https://reprap.org/forum/read.php?160,897027,897027#msg-897027
Als Neuling in dieser Gemeinschaft möchte ich Sie herzlich aus dem Allgäu grüßen.

Ich habe ein Anliegen bezüglich meines Druckers. Leider ist der Schrittmotortreiber defekt. Obwohl ich bereits einen neuen bestellt habe, gelingt es mir nicht, den Motor in Betrieb zu nehmen.

Muss man vielleicht eine Firmware aufspielen oder sonstige Einstellungen vorzunehmen?

Ich wäre Ihnen für Ihre Unterstützung sehr dankbar.
Ich hoffe, ich habe mein Thema in die richtige Kategorie eingeordnet.

Mit freundlichen Grüßen
Zafer Aydin]]> Dream61 Stepper Motors, Servo Motors, DC Motors Thu, 31 Jul 2025 15:32:46 -0400 https://reprap.org/forum/read.php?160,896351,896399#msg-896399 Re: Y motor ticks after stopping https://reprap.org/forum/read.php?160,896351,896399#msg-896399
It turned out that the Mega board was the problem. Once I swapped out the arduino clone, it started functioning correctly.
Thanks for all the views. Is there a way to close this post?
Scot]]> Progr3ss Stepper Motors, Servo Motors, DC Motors Wed, 08 Jan 2025 16:14:43 -0500 https://reprap.org/forum/read.php?160,896351,896357#msg-896357 Re: Y motor ticks after stopping https://reprap.org/forum/read.php?160,896351,896357#msg-896357 VDX Stepper Motors, Servo Motors, DC Motors Wed, 01 Jan 2025 12:22:14 -0500 https://reprap.org/forum/read.php?160,896351,896351#msg-896351 Y motor ticks after stopping https://reprap.org/forum/read.php?160,896351,896351#msg-896351 I think I am missing something simple here, I hope someone can help.

I have put together a Bear Prusa clone, kinda. Anyway, I printed some parts and assembled it mostly like a Bear. It is using Ramps 1.4 and Drv8825 drivers.

My issue is that the Y motor has some clunkiness sometimes, then the printer errors and has to reset. If I home the printer, sometimes it stops fine, then starts ticking about every second for a minute or two before needing to reset.

I have run it without the y belt and get the same symptoms.

I have swapped driver boards, both Drv8825 and the A4988. I have swapped stepper motors. I have swapped the ramps board. I have not swapped the Mega board. I have isolated the wire to the stepper so no cross talk.
I have adjusted the voltage. Changed the step settings from no microstep to 1/32. Set steps per mm to various things to account for weird missed steps.

It is only on the y. The heat sink gets hot and the motor whines.

I don't know what I am missing.
Thanks Scot]]> Progr3ss Stepper Motors, Servo Motors, DC Motors Tue, 31 Dec 2024 16:13:37 -0500 https://reprap.org/forum/read.php?160,894854,894859#msg-894859 Re: TMC2209 https://reprap.org/forum/read.php?160,894854,894859#msg-894859 I was asking it there would be a benefit to use a TMC2209 instead of the A4988.]]> Roberts_Clif Stepper Motors, Servo Motors, DC Motors Mon, 20 May 2024 17:17:16 -0400 https://reprap.org/forum/read.php?160,894854,894854#msg-894854 TMC2209 https://reprap.org/forum/read.php?160,894854,894854#msg-894854
Is there any benefit using a TMC2209 for extruders stepper motors.
Please be specific.

Thank You]]> Roberts_Clif Stepper Motors, Servo Motors, DC Motors Mon, 20 May 2024 10:39:36 -0400 https://reprap.org/forum/read.php?160,411419,894691#msg-894691 Re: 100:1 Geared nema 17 wont turn https://reprap.org/forum/read.php?160,411419,894691#msg-894691 VDX Stepper Motors, Servo Motors, DC Motors Thu, 25 Apr 2024 07:03:48 -0400 https://reprap.org/forum/read.php?160,411419,894689#msg-894689 Re: 100:1 Geared nema 17 wont turn https://reprap.org/forum/read.php?160,411419,894689#msg-894689 https://www.oyostepper.it/goods-304-Motore-passo-passo-Nema-17-bipolare-L%3D48mm-44Ncm-0018-gradi-168A-28V-con-riduttore-epicicloidale-100-1.html]]> maogeken Stepper Motors, Servo Motors, DC Motors Thu, 25 Apr 2024 05:40:17 -0400 https://reprap.org/forum/read.php?160,893118,893118#msg-893118 How do I calculate the theoretical max speed of a motor? https://reprap.org/forum/read.php?160,893118,893118#msg-893118
- RepRap calculator
- Alex Kenis provides a spreadsheet (see also links therein)
- Many thanks to Ryan Carlyle for his answer to "Real life stepper speed" here on 3D Printing.SE
- Zalophus Dokdo's Stepper Motors Calculator
- CNC.xyz's Stepper Motor Calculations

However, some of them simply don't explain all the math behind the numbers, there are differences see issue #38 between real-life measurements and theoretical predictions, and all the notation is a bit inconsistent.

It is possible to do the calculations using full ODEs and all that sort of jazz, but it's too much for a single motor. I prefer to see it as a black box with some exposed parameters, nothing more.

What I've got so far boils down to EMF:

A = 1.8o, angle per full step
U = 24 V, voltage
P = 2 mm, pitch
Nt = 20, teeth per gear
Nms = 16, microsteps per full step
v = 200 mm/s, desired speed
Th = 0.4 Nm, holding torque
Ir = 1.5 A, rated current
R = 5.75 Ohm, phase resistance
e = 75%, stepper current
L = 8.4 mH, motor inductance
f = 200 kHz, max step rate, see Klipper docs

Derived variables:

Ns = 360o / A = 200 step/rev, full steps per revolution
d = P * Nt = 40 mm/rev, distance per revolution
ds = d / Ns = 0.2 mm, distance per full step
dms = 1000 * ds / Nms = 12.5 um, distance per microstep
Ie = Ir * e / 100 = 1.125 A, effective max current
RD = Ns * Nms / d = 80 step/mm, rotational distance (is it supposed to be microsteps/mm?)
vmax = f * 1000 / RD = 2500 mm/s, max theoretical speed at this rate
RPMm = 60 * (v / d) = 300 rev/min, revolutions per minute at speed v; Alex also multiplies by Ns and divides by a magic number 200, both really make no sense to me
RPSm = RPMm / 60 = 5 rev/sec, revolutions per second
xir = 1.414 * PI * Th * (RPSm / Ir) ~ 5.9 V, rotation EMF. This is the point where questions start to arise though. I found another source ("Back emf due to rotation of stepper motor") where the rated current is used as well. To me, it looks like should be Ie even for peak EMF values since the current is limited by the corresponding driver. There is also an argument in issue #38 regarding the coefficients that should be used in practice

xii = RPSm * PI * Ie * (L / 1000) * (Ns / 2) ~ 14.8 V, Alex uses magic numbers again, I also failed to find the actual source for this formula.

Now, since I'm not sure these values/formulas are valid I can't move to the next part that's calculations of the maximum achievable speed. Even more so, there are two formulas that introduce even more confusion.

I'd be happy to see some solid advice or potential sources to read.]]> BoilThemMashThem Stepper Motors, Servo Motors, DC Motors Sun, 16 Jul 2023 10:25:32 -0400 https://reprap.org/forum/read.php?160,891921,891921#msg-891921 TMC2130 not working in standalone mode https://reprap.org/forum/read.php?160,891921,891921#msg-891921 My problem is that A4988 drivers work fine on my Robin Nano 1.2 Board but 2130 standalone drivers don't.
Any idea what the problem is.
(Yes jumpers adjusted, firmware 2130 standalone mode selected..)]]> ahmetcemturan Stepper Motors, Servo Motors, DC Motors Mon, 06 Feb 2023 06:59:23 -0500 https://reprap.org/forum/read.php?160,891263,891263#msg-891263 Klipper config Manta 8P servo steppers 3DP1000 printer https://reprap.org/forum/read.php?160,891263,891263#msg-891263
[reprap.org]

but it works only once then loops

Here is original firmware:

[github.com]

If somone has cfg file for Manta 8P with step/dir pins and LCD on exp1/2 let me know.
I also need to convert steps/mm to rotation distance.]]> jzagaja Stepper Motors, Servo Motors, DC Motors Tue, 06 Dec 2022 04:21:04 -0500 https://reprap.org/forum/read.php?160,891118,891118#msg-891118 NEMA 34 for DM556T driver https://reprap.org/forum/read.php?160,891118,891118#msg-891118 I have DM556T drivers (https://www.oyostepper.com/goods-112-Digital-Stepper-Driver-18-56A-20-50VDC-for-Nema-23-24-34-Stepper-Motor.html)
and I'd like to get NEMA 34 series motors for them. I have these two in mind and I'm not sure if I could get the stronger one considering the drivers.
https://www.oyostepper.com/goods-401-Nema-34-Stepper-Motor-70Nm-1001ozin-w-Brake-Friction-Torque-40Nm-566ozin-.html
https://www.oyostepper.com/goods-510-E-Series-Nema-34-Stepper-Motor-Bipolar-18deg-120-Nm-169968ozin-60A-86x86x1515mm-4-Wires.html
Or do you think that even the weaker one is on the edge and I should go even lower?
Controlled from PC via LPT port. It will be powered by a 36VDC switching power supply. Designed to drive the axes of a CNC router with a floor plan of 0.7 x 1.2 m (2x Y axis, 1x X axis, 1x Z axis), ball screws with a pitch of 5 mm. Wood "alloys" will be machined ]]> ludongzhan5 Stepper Motors, Servo Motors, DC Motors Wed, 23 Nov 2022 03:43:15 -0500 https://reprap.org/forum/read.php?160,882907,889351#msg-889351 Re: Servomotor disaster https://reprap.org/forum/read.php?160,882907,889351#msg-889351
I have no idea how to estimate the magnitude of the spike at the output when the motor is stopped suddenly. I guess you could calculate the total kinetic energy of the moving parts and equate that to electrical energy to get an estimate. My simple test in the video shows a 7V spike (31V or so) but that's captured by my DMM at who knows what sampling rate. An O-scope might be a better way to see what is going on.]]> the_digital_dentist Stepper Motors, Servo Motors, DC Motors Mon, 09 May 2022 10:06:08 -0400 https://reprap.org/forum/read.php?160,882907,889346#msg-889346 Re: Servomotor disaster https://reprap.org/forum/read.php?160,882907,889346#msg-889346 dc42 Stepper Motors, Servo Motors, DC Motors Mon, 09 May 2022 01:25:40 -0400 https://reprap.org/forum/read.php?160,882907,889340#msg-889340 Re: Servomotor disaster https://reprap.org/forum/read.php?160,882907,889340#msg-889340
Details, including a link to the KiCAD PCB design files is here.

Video or it didn't happen...





Note: I wired it without the power in/out connector because they have been back-ordered for 4 months (so far).
]]> the_digital_dentist Stepper Motors, Servo Motors, DC Motors Sun, 08 May 2022 17:04:59 -0400 https://reprap.org/forum/read.php?160,889153,889315#msg-889315 Re: Stepper driver selection https://reprap.org/forum/read.php?160,889153,889315#msg-889315 Duet 3 controller board could drive those motors directly without any additional heatsinking (though you would probably want to have a fan blowing on the board). The Duet ecosystem is under active development, has an active forum (primarily in English which helps some of us), and loads of online documentation.]]> the_digital_dentist Stepper Motors, Servo Motors, DC Motors Fri, 06 May 2022 11:06:39 -0400 https://reprap.org/forum/read.php?160,889153,889153#msg-889153 Stepper driver selection https://reprap.org/forum/read.php?160,889153,889153#msg-889153
I once again have a question which requires your vast knowledge. For a project that I am currently working on I am using 2 Nema 23 stepper motors which run at 24V, 2Amp peak current per phase. I am currently looking to use a stepper driver to control these to implement movement along with the code I have written. However when looking on google for a suitable driver I am unable to find anything other than TB6600's stepper drivers. Now initially there is nothing wrong with them. However it turns out that they aren't actually using TB6600 drivers but infact use TB67S109AFTG.

Therefor I would like to ask if one of you has any experience driving a bit stronger steppermotors and could recommend me stepper drivers which I could use.

The stepper data that it will drive is the following:
- 2Amp/phase
- 24V
- max 1/32 microstepping (will probably use 1/8 or 1/16)
- RPM, no RPM has been set so far but I will definitely not go above 250 RPM.

Hopefully this data will be enough information to give me some recommandations

Thank you in advance.]]> CptBlueberry Stepper Motors, Servo Motors, DC Motors Wed, 20 Apr 2022 09:22:43 -0400 https://reprap.org/forum/read.php?160,888531,888531#msg-888531 Lerdge X and stepper https://reprap.org/forum/read.php?160,888531,888531#msg-888531 mga Stepper Motors, Servo Motors, DC Motors Wed, 02 Mar 2022 08:49:22 -0500 https://reprap.org/forum/read.php?160,887886,887889#msg-887889 Re: Current for steppers of Anet A8 Plus https://reprap.org/forum/read.php?160,887886,887889#msg-887889 rq3 Stepper Motors, Servo Motors, DC Motors Sun, 16 Jan 2022 16:53:24 -0500 https://reprap.org/forum/read.php?160,887886,887888#msg-887888 Re: Current for steppers of Anet A8 Plus https://reprap.org/forum/read.php?160,887886,887888#msg-887888 VDX Stepper Motors, Servo Motors, DC Motors Sun, 16 Jan 2022 16:14:28 -0500 https://reprap.org/forum/read.php?160,887886,887886#msg-887886 Current for steppers of Anet A8 Plus https://reprap.org/forum/read.php?160,887886,887886#msg-887886 my Robin Nano v3 just arrived, MKS TMC2209 v2.0 drivers includet. But I don't know what current my stepper motors need.
The ons for the x-axis is labeled 'STEP MOTOR 42SHDC3025-24B' and I found different information about this driver on the internet. Some websites say it requires 0.9A, another website figures out 1.5A are needed. So how can I figure out what the right current is?]]> cysign Stepper Motors, Servo Motors, DC Motors Sun, 16 Jan 2022 13:21:45 -0500 https://reprap.org/forum/read.php?160,885317,885456#msg-885456 Re: Steppers move only manual https://reprap.org/forum/read.php?160,885317,885456#msg-885456 VDX Stepper Motors, Servo Motors, DC Motors Wed, 11 Aug 2021 13:45:31 -0400 https://reprap.org/forum/read.php?160,885317,885454#msg-885454 Re: Steppers move only manual https://reprap.org/forum/read.php?160,885317,885454#msg-885454
It was indeed too high a speed of the engines.
By really bringing this down quite a bit, it now works properly!

Thank you very much for this!]]> Schenkhuize Stepper Motors, Servo Motors, DC Motors Wed, 11 Aug 2021 13:12:24 -0400 https://reprap.org/forum/read.php?160,885317,885318#msg-885318 Re: Steppers move only manual https://reprap.org/forum/read.php?160,885317,885318#msg-885318 VDX Stepper Motors, Servo Motors, DC Motors Thu, 05 Aug 2021 03:29:50 -0400